🎨 Palette: Improve accessibility of scrollable output regions

[EffortlessSteven]

💡 What: Converted incorrectly used <label> elements for output regions to styled divs and linked them via aria-labelledby. Added tabindex="0" and role="region" to the output divs.
🎯 Why: <label> tags are only for form controls. Using them for generic divs violates accessibility standards. Adding tabindex="0" and role="region" makes these scrollable areas keyboard accessible and identifiable to screen readers.
📸 Before/After: Visual appearance is unchanged, but semantic structure and keyboard navigation are vastly improved.
♿ Accessibility: Fixed incorrect <label> usage, added keyboard navigation (tabindex="0") to scrollable areas, and provided screen reader context (role="region" and aria-labelledby).

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PR created automatically by Jules for task 14481894385163465906 started by @EffortlessSteven

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